<!DOCTYPE HTML>
<html>
<head>
  <title>Test DelayNode</title>
  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<pre id="test">
<script src="webaudio.js" type="text/javascript"></script>
<script class="testbody" type="text/javascript">

var gTest = {
  length: 4096,
  numberOfChannels: 1,
  createGraph: function(context) {
    var buffer = context.createBuffer(1, 2048, context.sampleRate);
    for (var i = 0; i < 2048; ++i) {
      buffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);
    }

    var source = context.createBufferSource();

    var delay = context.createDelay();

    source.buffer = buffer;

    source.connect(delay);

    ok(delay.delayTime, "The audioparam member must exist");
    is(delay.delayTime.value, 0, "Correct initial value");
    is(delay.delayTime.defaultValue, 0, "Correct default value");
    delay.delayTime.value = 0.5;
    is(delay.delayTime.value, 0.5, "Correct initial value");
    is(delay.delayTime.defaultValue, 0, "Correct default value");
    is(delay.channelCount, 2, "delay node has 2 input channels by default");
    is(delay.channelCountMode, "max", "Correct channelCountMode for the delay node");
    is(delay.channelInterpretation, "speakers", "Correct channelCountInterpretation for the delay node");

    expectException(function() {
      context.createDelay(0);
    }, DOMException.NOT_SUPPORTED_ERR);
    expectException(function() {
      context.createDelay(180);
    }, DOMException.NOT_SUPPORTED_ERR);
    expectTypeError(function() {
      context.createDelay(NaN);
    }, DOMException.NOT_SUPPORTED_ERR);
    expectException(function() {
      context.createDelay(-1);
    }, DOMException.NOT_SUPPORTED_ERR);
    context.createDelay(1); // should not throw

    // Delay the source stream by 2048 frames
    delay.delayTime.value = 2048 / context.sampleRate;

    source.start(0);
    return delay;
  },
  createExpectedBuffers: function(context) {
    var expectedBuffer = context.createBuffer(1, 2048 * 2, context.sampleRate);
    for (var i = 2048; i < 2048 * 2; ++i) {
      expectedBuffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * (i - 2048) / context.sampleRate);
    }
    return expectedBuffer;
  },
};

runTest();

</script>
</pre>
</body>
</html>
